Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc1766c1324f220…

MALICIOUS

PDF

41.5 KB Created: 2020-08-30 22:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2dbe349968056e7ba5d612abdbdaaae4 SHA-1: 1cb5eefadadcfa38caa76a328feaf41047f1ea7d SHA-256: bdc1766c1324f2208c65138a932ebaf9bb2dc09a61ef15a7a0fdd2b0f4769a78
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.com/wix?keyword=holi+holi+gidhe+vich+nach+patlo+mp3'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious infrastructure. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/wix?keyword=holi+holi+gidhe+vich+nach+patlo+mp3
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87960197539.pdf
    • https://cdn.shopify.com/s/files/1/0433/8486/4917/files/86139130403.pdf
    • https://cdn.shopify.com/s/files/1/0435/2599/6698/files/jingle_bells_piano_sheet_music_intermediate.pdf
    • https://cdn.shopify.com/s/files/1/0465/1188/2398/files/brillouin_spectroscopy.pdf
    • https://static.usrfiles.com/ugd/b8c837_82c0bf740d0c4bbcad856d7bcbf0050f.pdf
    • https://static.usrfiles.com/ugd/0049ca_ff99d632763b47c9a3faec83ad8b8bb7.pdf
    • https://static.usrfiles.com/ugd/73cb9e_038519d0d7bf4bf091dcae30248af50c.pdf
    • https://static.usrfiles.com/ugd/b8c837_f78a73b69802460994f2350c47da489b.pdf
    • https://cdn.shopify.com/s/files/1/0438/0921/0529/files/super_mario_bro.pdf
    • https://cdn.shopify.com/s/files/1/0440/6562/0118/files/abbey_college_performing_arts_facebook.pdf
    • https://cdn.shopify.com/s/files/1/0438/0937/4365/files/purinorinokukewilabobimo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0097/8853/files/appendicitis_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0432/1011/3188/files/87693720944.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a625bdb0bbc4245b356fa1e0d79689b.pdf
    • https://static.usrfiles.com/ugd/e1d12c_1b1d85e4a9b6446b93d1262a675c5bd4.pdf
    • https://static.usrfiles.com/ugd/c4ccc4_dcbab34f4c424cd3934ac50737a3f96a.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://cdn.shopify.com/s/files/1/0440/6562

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bf4.bin
1061f4abc3c3673b7f78de1c9d6ac8ee5b46be441b9d3d66e580fb2d8463ffe7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF4 5400 bytes
font_01_sfnt_off00006e29.bin
6a529c9b863096772c96402139541ccb62927d760f67edc6e6dfdd27c786c8ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E29 13664 bytes

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